Table 4 Results from the linear mixed-effects models from baseline to post and between- and within-group effect sizes displayed in cohen’s d.

From: Prevention and treatment of social anxiety disorder in adolescents: mixed method randomised controlled trial of the guided online intervention SOPHIE

  

Coefficients from baseline to post linear mixed-effects models (SOPHIE vs. CAU)

Effect sizes Cohen’s d [95% CI]

  

Estimates (SE)

t [CI]

p

Between-group

Within-group baseline post

SOPHIE

CAU

SPIN

Intercept

6.90 (1.98)

3.48 [3.00;10.79]

0.001

   
 

Mid-intervention

−1.22 (1.78)

−0.69 [−4.72; 2.28]

0.492

0.13 [−0.21; 0.47]

  
 

Post-intervention

−3.23 (1.81)

−1.78 [−6.79; 0.34]

0.076

0.35 [0.01; 0.69]

0.60 [0.25; 0.95]

0.24 [−0.10; 0.58]

SPIN SAD

Intercept

4.17 (2.49)

1.68 [−0.73; 9.07]

0.095

   
 

Mid-intervention

0.99 (1.93)

0.52 [−2.80; 4.79]

0.607

−0.12 [−0.46; 0.22]

  
 

Post-intervention

−2.90 (2.00)

−1.45 [−6.84; 1.04]

0.148

0.28 [−0.06; 0.62]

0.68 [0.34; 1.04]

0.44 [0.10; 0.78]

SPIN

Intercept

9.47 (3.94)

2.40 [1.63; 17.31]

0.019

   

(subclinical)

Mid-intervention

−7.08 (3.80)

−1.86 [−14.63; 0.47]

0.066

0.39 [0.73; 0.05]

  
 

Post-intervention

−5.31 (3.72)

−1.43 [−12.71; 2.09]

0.157

0.31 [−0.04; 0.65]

0.16 [−0.18; 0.51]

−0.15 [−0.49; 0.19]

PHQ-9

Intercept

2.25 (0.56)

4.03 [1.15; 3.35]

< 0.001

   
 

Mid-intervention

−1.70 (0.80)

−2.14 [−3.27; −0.14]

0.033

0.02 [−0.32; 0.36]

  
 

Post-intervention

−3.56 (0.82)

−4.35 [−5.18; −1.95]

< 0.001

0.38 [0.04; 0.72]

0.82 [0.46; 1.17]

0.18 [−0.15; 0.53]

GAD-7

Intercept

1.96 (0.54)

3.59 [0.88; 3.03]

< 0.001

   
 

Mid-intervention

−0.73 (0.72)

−1.01 [−2.14; 0.69]

0.315

0.17 [−0.17; 0.51]

  
 

Post-intervention

−3.05 (0.73)

−4.20 [−4.49; −1.62]

< 0.001

0.85 [0.49; 1.20]

1.14 [0.77; 1.50]

0.23 [−0.11; 0.58]

SAS-A

Intercept

11.03 (3.29)

3.35 [4.56; 17.50]

0.001

   
 

Mid-intervention

−1.53 (1.92)

−0.80 [−5.30; 2.25]

0.427

0.21 [−0.14–0.55]

  
 

Post-intervention

−5.57 (1.93)

−2.89 [−9.37; −1.77]

0.004

0.64 [0.29–0.99]

1.00 [0.64; 1.36]

0.41 [0.06; 0.74]

KIDSSCREEN

Intercept

7.48 (2.16)

3.46 [3.23; 11.74]

0.001

   
 

Mid-intervention

0.47 (0.79)

0.79 [−1.08; 2.02]

0.551

−0.06 [−0.40; 0.28]

  
 

Post-intervention

2.82 (0.79)

3.56 [1.26; 4.38]

< 0.001

−0.68 [−1.02; −0.33]

−0.70 [−1.05; −0.34]

0.08 [−0.26; 0.42]

RSES

Intercept

5.94 (0.87)

6.80 [4.22; 7.67]

< 0.001

   
 

Mid-intervention

0.46 (0.54)

0.85 [−0.60; 1.52]

0.398

−0.18 [−0.52; 0.16]

  
 

Post-intervention

0.81 (0.54)

1.50 [−0.25; 1.88]

0.134

−0.31 [−0.65; 0.03]

−0.13 [−0.47; 0.21]

0.23 [−0.11; 0.57]

ESAK

Intercept

−0.02 (1.79)

−0.01 [−3.54; 3.50]

0.991

   
 

Mid-intervention

1.45 (1.23)

1.18 [−0.96; 3.86]

0.237

−0.25 [−0.59; 0.09]

  
 

Post-intervention

1.18 (1.28)

0.93 [−1.33; 3.69]

0.355

−0.19 [−0.53; 0.15]

0.13 [−0.33; 0.35]

0.21 [−0.13; 0.55]

  1. Notes: All linear mixed-effects models included the baseline value of investigated outcome value as a fixed covariate and a random effect of participants. SPIN = Social Phobia Inventory; PHQ-9 = 9-item version of the Patient Health Questionnaire; GAD-7: 7-item version of the Generalized Anxiety Disorder; SAS-A = Social Anxiety Scale for Adolescents; KIDSSCREEN = quality of life assessment KIDSCREEN-10; RSES = Rosenberg Self-esteem Scale; ESAK = Parents’ Questionnaire on Social Anxieties in Childhood and Adolescence.
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